JPS5813364Y2 - Lubricating oil storage amount automatic control device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device that automatically controls the amount of lubricating oil stored in an oil tank equipped with a central lubrication system, which is generated by replenishing lubricating oil from a terminal tank and returning oil from each distribution valve. The present invention is characterized in that the sealing accuracy of the lubricating oil replenishment valve for the oil tank is improved.

A relatively large-scale lubrication system is equipped with an appropriate number of central lubrication systems, and each central lubrication system performs an independent lubrication operation, but in order to save labor, each of these central lubrication systems is equipped with a separate distribution valve. It must be equipped with the ability to absorb and process the oil returned from On the other hand, it must be equipped with the ability to automatically replenish a certain amount of lubricating oil from a terminal tank.

Therefore, the present applicant previously submitted a centralized lubrication system (Utility Model Application Publication No. 53-21285) as schematically shown in Fig. 2, but the replenishment valve mechanism had the following defects that were difficult to resolve. .

That is, the device shown in the home country discharges lubricating oil (hereinafter abbreviated as oil) such as grease stored in advance in a cylinder 1 that also serves as an oil tank to a circuit 2 by a pump 7 installed below the oil tank, and also performs switching. By operating the valve 3, the circuit 2 and the two main pipes 4, 5 are alternately connected, and oil is supplied to a large number of lubricated points via each distribution valve 6, 6... It is.

On the other hand, the amount of storage in the cylinder 1 is determined by the land 9 formed in the middle part of the piston rod 8 disposed in the cylinder 1 and the opening of the passage 11.12 formed in the block 10 into which the rod 8 is inserted. It forms a valve mechanism that controls the

That is, since the piston 13 is always subjected to a pressing force from above by the spring 14, the piston 13 moves downward as the oil in the cylinder 1 is consumed.

When the opening of the passage 11 is opened by the land 9, the oil pressurized in the supply pipe 15 whose one end is connected to the terminal tank is transferred to the passage 11 bored in the passage 11 and the piston rod 8. The piston 13 is automatically replenished into the cylinder 1 through the replenishment action.
Due to the upward movement of the land 9, the land 9 blocks the passage 11, 16 and automatically stops the replenishment action.

On the other hand, the passage 12 that communicates with the return line 17 normally communicates with the cylinder 1 via the passage 16 in the rod, so that the oil filled in the main pipe 4.5 expands or the distribution valve 66. The return oil pushed into the return line 17 by the operation of the cylinder 1 is absorbed into the cylinder 1 through the passage 12.16, and the opening of the passage 12 is further closed with the land 9 to control the storage amount in the cylinder 1. It is something that can be done.

As mentioned above, the device shown in FIG. 2 has a structure that blocks the opening of the passage 11 with the circumferential surface of the piston rod 8 to stop the supply of oil from the terminal tank to the cylinder 1. It is inevitable that a clearance is formed between the sliding surfaces of the block 8 and the block 10, and in particular, since oil is held at high pressure in the supply pipe 15, the opening of the passage 11 is closed with the land 9. Even in this state, oil leaks from the supply pipe 15 to the cylinder 1 through the clearance,
There was a drawback that the original storage amount control function of the device was significantly impaired.

The present invention was devised in view of the above points, and its purpose is to improve the sealing accuracy in the replenishment valve mechanism by using a pressure-balanced cone-shaped valve formed separately from the piston rod. be.

The structure of the present invention is that a cylindrical cone-shaped valve is arranged between a hole bored in a flock provided at the top of the cylinder and a piston rod inserted into the shaped hole, and a cylindrical cone-shaped valve is formed around the cone-shaped valve. A supply oil passage formed in the block is opened in the annular gap, and an umbrella-shaped conical surface formed in the cone-shaped valve is pressed against a valve seat formed at the lower edge of the annular gap by a spring. , a bushing ring is provided around the piston rod protruding from the upper part of the cone-shaped valve, and a bushing ring is provided in the lower area of the valve seat and the suction side of a pump provided in a part of the cylinder is inserted into the rod. The supply oil passage and the pump suction side are communicated through a drilled passage, and a cone-shaped valve linked to the piston rod shuts off the communication between the supply oil passage and the pump suction side.When the amount stored on the pump suction side is less than a specified amount, the piston The cone valve is forcibly opened by the rod to supply lubricating oil from the supply oil passage to the suction side of the pump through the annular gap and the passage in the piston rod.
) When the reservoir i reaches a predetermined amount, the cone valve is forcibly brought into contact with the valve seat by a spring as the piston rod moves, and the valve is closed, thereby cutting off the supply oil passage and the pump suction side. This is a highly developed lubricating oil storage amount variable control device.

An embodiment of the present invention will be described below with reference to FIG.

In the embodiment shown in FIG. 1, a cone-shaped valve 21, which corresponds to a part of the supply valve mechanism, and a movable sleeve 22, which corresponds to a part of the return valve mechanism, are slidably arranged around the piston rod 2°. It is placed.

The rod 20 is constructed by connecting an upper bar 20a with a relatively small diameter and a lower bar 20b with a large diameter through an embedded ring 28 so that they do not separate during operation. The lower bar 20b is airtightly supported via a CIJ song 6 in the lower region of a hole 27 that vertically penetrates inside a valve block 25 fixed to the upper part of the cylinder 24 and also serving as a lid. .

Note that it is also possible to form the rod 20 from a single material instead of the two rods 20a and 20b;
By forming a plurality of bars as in the embodiment, it is easy to align the sliding parts of each bar.

On the other hand, a bag-shaped cap 28 is fixed to the upper end of the hole 27 formed in the block 25 via a screw mechanism 29, and a sleeve 30 for a valve seat is pushed into the upper area of the hole 27 by the cap 28 and fixed. Furthermore, the rod 2
A support rod 20c provided at the upper end of the cap 28 projects above the cap 28, and a cam 31 is fixed to the upper end of the support rod 20c.

The cone-shaped valve 21 described above has a cylindrical shape as a whole, and the upper bar 20a of the rod 20 is disposed within the sleeve 30.
The shaped valve 21 forms an annular gap 34 between the opening valve 21 and the inner surface of the sleeve 30 by an annular groove 33 on its curved surface, and also forms an annular gap 34 between the opening valve 21 and the inner surface of the sleeve 30.
An umbrella-shaped conical surface 35 is formed on the lower groove edge of the conical surface 35.
and a valve seat 36 formed by a corner of the lower surface of the sleeve 30, and a passage 38 is bored between the annular gap 34 and a replenishment port 37 formed on the upper surface of the block 25. and a supply pipe 39 are connected via a connecting pipe 40.

Further, the movable sleeve 22 described above is located below the cone-shaped valve 21 and is located at the upper bar 20a of the rod 20.
The movable sleeve 22 has 01J rings 41.4 in the upper and lower two ring grooves around the movable sleeve 22, respectively.
2 is provided, and a hole 27 is provided through these OIJ songs 1 and 42.
It is placed airtight inside.

Further, the lower surface of the sleeve 22 is opposed to a stepped stopper 43 formed in the block 25 and a shoulder 44 on the upper end surface of the lower bar 20b of the rod, so that the movable sleeve 22 and the cone-shaped valve 21 between spring 4
5 interposed between the movable sleeve 22 and the stopper 43.
In addition, while the cone-shaped valve 21 is brought into pressure contact with the valve seat 36, the chamber 46 formed between the cone-shaped valve 21 and the movable sleeve 22 and the return port 47 formed on the upper surface of the block 25 are connected to the passage 48. It is communicated via.

Furthermore, the piston rod 20 has a passage 49 therein.
is installed.

The passage 49 has one end open to the end face of the rod, and the other end opened to ports 50 and 51 formed at two high and low locations on the side face of the rod.

Further, the piston rod 20 slidably supports a piston 52 provided in the cylinder 24 at its lower end.

The rod 20 is provided with a stopper 53 made of a snap ring at its lower end, and a stopper 54 is also formed by an end surface formed by changing the diameter of the rod above the rod 20. The distance between the two stoppers is determined in advance by the thickness of the piston 52. The piston 52 is formed to be larger than the piston 52 by a predetermined amount.
The piston 52 is configured to freely move within a predetermined range S along the rod 20, and a spring 55 is provided at the upper part of the piston 52 to press the piston 52 against the lower stopper 53.

Furthermore, a chamber 57 is formed in the cap 28 on the upper part of the block 25, and a cylindrical spring seat 5 is provided in the chamber 5γ.
The cam 31 is brought into contact with the upper end surface of the cone-shaped valve 21 by the force of a spring 58a, and the force of another spring 58b provided in the chamber 57 is applied to a spring seat connected to the lower end of the support rod 20c. It is held in place.

Furthermore, a bushing ring 60 fixed near the upper end of the rod 20 in the same chamber 57 is brought into contact with the upper end of the cone-shaped valve 21, while a drain port 61 is opened in the chamber 57.

In addition to the above, a pump 63 is provided at the bottom of the cylinder 24, a discharge line 65 is provided between the pump 63 and the switching valve 64, and a return line 66 is provided between the switching valve 64 and the return port 47. The switching valves 64 are each provided with main pipes 67, 68, and these main pipes 67, 68 are provided with a large number of distribution valves 69, 6.
9... is connected.

The illustrated embodiment is constructed as described above, and its operation will be explained below.

In FIG. 1, the spring 55 pushes the piston 52 downward to bring the piston 52 into close contact with the upper surface of the oil in the cylinder 24.
seems to fluctuate up and down.

Also, in the previous case, the spring 45 pushed the cone-shaped valve 21 upward and the movable sleeve 22 downward, respectively, due to its tension, but since the downward movement of the movable sleeve 22 is restricted by the stopper 43, the cone-shaped valve The valve 21 is pressed onto the valve seat 36.

In this case, the pressure in the supply pipe 39 always acts on the chamber 34 through the passage 38, but since the pressure receiving area is the same on the upper and lower walls of the annular groove 33 around the cone-shaped valve, it acts on the chamber 34. The pressure itself does not generate a force that causes the cone valve 21 to malfunction in the axial direction.

Therefore, the pressure does not interfere with the operating force of the cone valve 21.

Further, between the cores, the switching valve 64 is in a neutral position, separating the discharge line 65 of the pump 63 from the main pipe 67.6B, while connecting the main pipe 67.68 to the return line 66, passage 48, port 51, passage 49. In this state, the cylinder 24 is connected to the cylinder 24 via the cylinder 24.

Therefore, while temporarily moving the switching valve 64 to the right,
When the pump 63 is driven, the oil in the cylinder 24 is supplied to the main pipe 67 on one side through the discharge line 65, and the supply pressure sequentially operates the distribution valves 69, 69, etc. The point is refueled.

The oil pushed out to the main pipe 68 on the other side by the operation of each of the distribution valves 69, 69, . . . is returned to the cylinder 24 via the return line 66, the passage 48, the port 51, and the passage 49.

After lubricating each lubricated point for an appropriate period of time, the switching valve 64 is switched to the neutral position, the pump 63 is stopped at the same time, and the oil in the main pipes 67 and 68 is removed before switching to the next lubricating operation. When the oil expands due to temperature changes, the expansion is absorbed into the cylinder 24 via the return line 66 and the oil return passages 48, 51, 49 mentioned above.

In the above case, the piston 52 has a predetermined amount of free movement range S at its upper part, and only when the amount of oil returned is greater than the amount at which the piston 52 comes into contact with the upper stopper 54 can the rod 2
Move 0 up.

Then, by the upward movement of the rod 20, the movable sleeve 2
2, and a pair of OIs provided above and below the sleeve 22.
The passage 4B is closed between the J-rings 41 and 42, and the cylinder 2
Regulate the return oil to 4 and adjust the storage amount.

In the above state, when the piston 52 moves further upward due to the expansion of the oil in the cylinder 24, the rod 20 is further pushed up.

In this case, the movement of the cone valve 21 is restricted by contacting the valve seat 36, so if the upward movement of the rod 20 continues, the cam 31 will move through the support rod 20c to the upper switch γ.
Oa is activated to issue an electrical alarm, while a port 50 formed in the rod 20 opens at the upper end of the cone valve 21, allowing oil in the cylinder 24 to flow into the passage 49 in the rod 20.
The pressure is then discharged through the chamber 57 to the drain port 61 to ensure safety.

When the oil in the cylinder 24 is consumed by repeated oil supply operations and the piston 52 comes into contact with the lower stopper 53 by the spring 55, the rod 20
and begin to descend as one.

When the amount of oil stored in the cylinder 24 becomes less than a predetermined amount, the cone valve 21 is pushed down and separated from the valve seat 36 via the bushing ring 60.

Therefore, the high pressure oil in the supply pipe 39 flows through the passage 38 and the port 5.
1. The cylinder 24 is automatically refilled via the passage 49.

Note that the lower switch 70b is activated when the storage amount in the cylinder decreases as described above and the cone-shaped valve 21 moves away from the valve seat 36 and becomes ready for replenishment.If the replenishment is insufficient, the cone-shaped valve 21 is further activated Since it moves downward, the cam 3 along with the valve seat 59
1 is lowered to actuate the switch 70b.

As a result, an electrical signal is generated indicating the lower limit of the oil level.

In FIG. 1, when the movable sleeve 22 moves upward as described above, the passage 4 is opened between the two 01J rings 41 and 42 provided at the upper and lower positions of the movable sleeve 22.
8, the substantially movable sleeve 22
The clearance between the circumferential surface of the hole 27 and the inner surface of the hole 27 can be reduced,
The sealing accuracy against return oil is extremely good.

On the other hand, in FIG. 2, upper and lower O rings 18 and 19 are connected to the opening of the passage 11 based on the same technical means as in FIG.
Although the clearance around the rond 8 is reduced by sealing it between the passages 8 and 8, the pressure of the replenishment oil acting on the passage 11 from the supply pipe 15 is smaller than that of the passage 4 in FIG.
Since the pressure is much higher than the pressure of the return oil acting on 8, the sealing accuracy against replenishment oil by the Q IJ song in Figure 2 is much lower than the sealing accuracy against return oil by the O-ring in Figure 1. is inevitable.

In addition, the O-ring 41 in FIG. 1 and the O-ring 1 in FIG.
8 is easily damaged because it comes into contact with the corner part of the passage opening when it moves up and down, but the number of times the movable sleeve 22 opens and closes the opening of the return oil passage 48 in FIG. 1 and the number of operations in FIG. When comparing the number of operations in which the land 9 opens and closes the opening of the supply oil passage 11 in , the number of operations in FIG. 2 is much more frequent, so the OIJ ring 18 in FIG. In the short term, the seal accuracy is compromised and therefore the effectiveness of its installation is poor.

Note that the 0 ring 41 in FIG. 1 may also be damaged during long-term use, so it is not necessary to install it in advance, but even if the 0 ring 41 is not installed from the beginning,
As mentioned above, since the return oil is at low pressure, its leakage can be prevented.

In FIG. 1, the movable sleeve 22 is configured separately from the rod 20, but the lower end of the spring 45 is connected to the hole 27.
By adopting a structure in which the rod 20 and the movable sleeve 22 are supported by the block 25, the rod 20 and the movable sleeve 22 can be integrated.

As described above, the present invention opens the supply passage 38 in the annular gap 34 formed around the cone-shaped valve 21, and the cone-shaped valve 21 The force of pushing the cone-shaped valve 21 upward and the force of pushing the cone-shaped valve 21 downward by the annular gap 34 are perfectly balanced. do.

Therefore, no matter how high or how the pressure of the make-up oil acting on the passage 38 changes, the cone-shaped valve 21 will not malfunction due to the pressure of the make-up oil. The operating force of the shaped valve 21 is not hindered.

Therefore, the cone-shaped valve 21 can be operated smoothly, and in combination with the line contact function between the valve seat 36 and the conical surface 36, the sealing accuracy of the cone-shaped valve 21 against high-pressure supply oil is improved, and the oil This has the effect of preventing leakage and reliably preventing excessive accumulation of oil in the cylinder 24, which also serves as an oil tank.

Furthermore, the opening/closing part of the cone-shaped valve 21 is similar to the conventional product shown in FIG. 2 in which the corner part of the piston rod is also used as a replenishment valve.
Since the 01J ring does not pass through the opening, the corner portion will not tear the 01J ring when opening and closing the replenishment path, so the sealing accuracy as a replenishment valve is further improved.

Furthermore, as mentioned above, the cone-shaped valve 21 and the valve seat 36 are in line contact, and when grease is used as a lubricant, for example, the thickening agent separated from the grease is transferred to the piston rod in the case shown in FIG. It often solidifies in the clearance of the circumferential surface and interferes with the operation of the rod.
Since the present invention uses line contact as described above, there is an advantage that even if the thickener solidifies, the operation of the cone valve 21 will not be hindered.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an explanatory view of a conventional example. 20... Piston rod, 21... Cone valve, 22... Movable sleeve, 36...
...Valve seat, 37... Supply port, 39...
... Supply pipe, 47 ... Return port, 60.
... Butsu ring, 63 ... Pump,
65...Discharge line, 66...Return line.

Claims (1)

[Scope of utility model registration request] A cylindrical cone-shaped valve 21 is disposed between a hole bored in a block 25 provided at the top of the cylinder 24 and the piston rod 20 inserted into the hole 27, and a cylindrical cone-shaped valve 21 is formed around the cone-shaped valve 21. A supply oil passage 38 formed in the block 25 is opened in the annular gap 34, and the annular gap 3
An umbrella-shaped conical surface 35 formed on the cone-shaped valve 21 is pressed against a valve seat 36 formed on the lower edge of the cone-shaped valve 21 with a spring 45. A bushing ring 60 is provided around the valve seat 36 and the inside of the hole 27 in the lower area of the valve seat 36 and the cylinder 2.
The suction side of the pump 63 provided at the bottom of the rod 2
The lubricating oil storage amount variable control device is communicated with each other through a passage 49 bored in the interior of the lubricating oil reservoir.